1. To Do… OWL Lectures Discussion
Chapter 12 (Part 1) due Friday, April 13
Lectures
Continue reading Chapter 12
Discussion
Chapter 12 text homework

2. Clicker Question
How do lithium, fluorine, and cesium compare with regard to attraction for an electron in a shared bond?
a) Li>Cs>F
b) F>Cs>Li
c) F>Li>Cs
d) Li>Cs>F
e) Cs>F>Li

3. Electronegativity

4. Table 12-1 p271

5. Clicker Question
Rank the following bonds from least polar to most polar:
Si-Cl P-Cl Mg-Cl S-Cl
A) S-Cl, P-Cl, Mg-Cl, Si-Cl
B) P-Cl, S-Cl, Si-Cl, Mg-Cl
C) Mg-Cl, Si-Cl, P-Cl, S-Cl
D) Mg-Cl, S-Cl, P-Cl, Si-Cl
E) S-Cl, P-Cl, Si-Cl, Mg-Cl

6. From the Periodic Table…
Electron configurations
Charges for ions in compounds (and thus formulas for compounds)
Trends
Atomic radius
Ionization energy
Electronegativity
Polarity of Bonds

7. Lewis Structures
Determine the total number of valence electrons in the molecule.
Form at least one bond between atoms in the molecule (a pair of electrons is a bond)
Arrange the rest of the electrons (in pairs) to satisfy the octet rule or duet rule (for hydrogen).
Watch for exceptions.

8. Patterns in Lewis Structures
While these patterns do not hold 100% of the time, they are good general guidelines when starting. C N O F
# bonds 4 3 2 1
# lone pairs